JPH0957526A - Cutter for cast steel piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the properties of the cut surface of a cast steel piece in a cutter for cast steel piece composed of a fixed lower edge, an upper edge engagingly installed in a holder which is fitted to a fixing guide so as to be lifted and lowered and liners which are respectively engagingly installed in the sliding parts of the fixing guide and the holder, by eliminating play due to the abrasion of the liners so that a clearance between the upper and lower edge is strictly adjusted and controller. SOLUTION: A liner 13 attached to the retainer plate 6b of a holder 6a by a bolt is energized to be projected by a coned disc spring mounted in a stepped shaft hole formed in the retainer plate 6b so that the liner 13 is pressingly attached to a liner 11 engagingly installed in a fixing guide and worn parts of the liner 11 can be absorbed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cutting a cast steel piece such as a billet obtained by rolling a cast steel ingot or a billet obtained by continuous casting.

[0002]

2. Description of the Related Art Cast steel pieces such as billets obtained by continuous casting and rolling of cast steel ingots are cut to a required length by a cutting machine, and also cut at the leading and trailing end portions and defective portions such as scratches and cracks. Removed and cut for specimen collection. FIG. 1 shows a conventional cutting device, in which an inclined fixed lower blade 1 having a square blade notched upward,
The upper blade 4 is attached to a holder 6 which is slanted up and down along a fixed guide 5 by a hydraulic cylinder 2, and cooperates with the lower blade 1 to cut a cast steel piece 3 and has an upper blade 4 having a downwardly cut square blade. As shown in FIG. 2, the upper blade 4 is attached to the holder 6 via a shim 7 with a bolt (not shown), and by switching the shim 7 to a blade having a different thickness, The clearance c with the blade 4 can be adjusted.

As shown in FIG. 3, the holder 6 has a holder body 6a and a holding plate 6b which are H-shaped in cross section, and are fitted with fixed guides 5 projecting from a frame 9 on both sides thereof. Liners 11 and 12 are attached to the sliding portions of the holder 6 by bolts (not shown).

[0004]

The clearance c (FIG. 2) between the lower blade 1 and the upper blade 4 of the cutting device has a great influence on the properties of the cut surface of the cast steel slab, and the smaller the clearance c, the more the cut surface is cut. Although the property is improved, the cutting resistance is increased and the life of the blade is reduced. In addition, there is a risk that the upper blade may come into contact with the lower blade during a test by idle driving before operation. Therefore, it is extremely important to properly maintain the clearance between the upper blade and the lower blade, but at the time of cutting, the upper blade 4 has an action of trying to separate from the lower blade 1 due to cutting resistance, so that the holder 6 is removed. As shown in FIG. 3, the liners 11 and 12 of the portion a slide against each other in a state of being strongly crimped. As a result, the liner at the part a is likely to wear, the play causes backlash, and the initially set clearance also increases.

The readjustment of the clearance after the backlash is performed by replacing the liner and adjusting the shim, but the work requires a great deal of labor and time, and the operation must be stopped during that time. It is an object of the present invention to provide a cutting device that facilitates clearance adjustment between blades, stabilizes a small clearance for a long period of time, improves the cut surface shape of a cast steel piece, and can reduce the frequency of liner replacement. And

[0006]

SUMMARY OF THE INVENTION Therefore, according to the present invention, one liner is pressure-bonded to the other liner by an elastic means so that rattling does not occur between the liners even when the liner is worn. That is, the present invention has an inclined lower blade provided with a square blade notched upward, and an upper blade having a downwardly cut rectangular blade that cuts the cast steel piece in cooperation with the lower blade, and the lower blade In the cutting device, one of the upper blade and the upper blade is supported by a fixed guide so as to be able to move up and down diagonally, and is attached to a holder that moves up and down by a hydraulic cylinder, and liners are attached to the sliding parts of the holder and the fixed guide, Of both liners that slide against each other on the holder and fixed guide side,
It is characterized in that one liner is pressed against the other liner by an elastic means.

In order to prevent backlash from occurring even if the liner is worn, one of the liner parts a or b in FIG.
At least one of them may be urged by the elastic means to project so that the amount of wear can be absorbed. Since the elastic force of the elastic means is much smaller than the force of the cutting resistance, there is no particular problem even if the elastic force is newly added. A spring is usually used as the elastic means used in this device. As shown in FIG. 4, this spring is provided only on the b side, and further on the holder side for ease of processing, assembly and replacement,
It is preferable that the liner on the holder side is biased so as to protrude from the holder so as to be pressed against the liner on the fixed guide side.

[0008]

FIG. 5 shows a liner 13 attached to a holding plate 6b. The holding plate 6b is formed with stepped shaft holes 14 having large diameters on both sides. In the liner 13 in which the protrusions 13a at the upper and lower ends are fitted in the recesses 6c of the pressing plate 6b, the stepped hole 1 is formed at a position corresponding to the shaft hole 14.
5 is formed, a heavy load disc spring 16 is attached to the large diameter portion of the shaft hole 14 on the liner side, and a light load disc spring 17 is attached to the large diameter portion of the opposite side. 18 is passed through the holding plate 6b, the plain washer 20 is passed through the protruding end thereof, and then the hard lock 19 is screwed and fixed, so that the disc spring 16 forms a clearance δ between the holding plate 6b and the liner 13. I am doing it. In the figure, 21 is a washer.

The holding plate 6b to which the liner 13 is attached as described above is fixed to the holder body 6a by bolts (not shown). FIG. 6 shows the liner 13 when assembled to the holder body 6a. According to the present invention, when the liner at the portion a shown in FIG. 4 is worn, the liner 13 is projected by the disc spring 15 as shown in FIG. , Wear is absorbed. The wear of the liner is replaced in the same manner as before when a certain amount of wear has progressed.

[0010]

The present invention is configured as described above and has the following effects. According to the cutting device of claim 1,
The upper blade will move up and down stably without rattling until the liner at the sliding part reaches a certain amount, and the clearance with the lower blade will not be unstable due to rattling, and will be a stable clearance for a long time. Can be managed.
Therefore, the blade clearance can be adjusted and managed very tightly as compared with the conventional case, and the shape of the cut surface of the cast steel piece can be significantly improved.

As in the cutting device according to claim 2 or 3,
If the elastic means is provided on the holder side, processing, assembling, and removal thereof can be easily performed.

[Brief description of drawings]

FIG. 1 is a side view of a cutting device.

FIG. 2 is a view showing a relationship between an upper blade and a lower blade of the cutting device.

FIG. 3 is a sectional view of a main part of the cutting device.

FIG. 4 is a schematic view of a main part of a holder part.

FIG. 5 is a sectional view of a holding plate of a holder.

FIG. 6 is a cross-sectional view of a holding plate when assembled.

[Explanation of symbols]

1 ・ ・ Lower blade 2 ・ ・ Hydraulic cylinder 3 ・ ・ Cast steel slab 4 ・ ・ Upper blade 5 ・ ・ Fixing guide 6 ・ ・ Holder 7 ・ ・ Shim 9 ・ ・ Frame 11, 12, 13 ・ ・ Liner 14 ・ ・ Shaft hole 15 ・ ・ Stepped holes 16, 17 ・
・ Disc spring 18 ・ ・ Bolt 19 ・ ・ Hard rock 20, 21 ・ ・ Washer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noboru Kaji 876-12, Kazahaya, Akitsu-cho, Toyota-gun, Hiroshima Prefecture (72) Inventor Yoshitaka Hirooka 3-3-11 Miyajima Nishi, Ono-cho, Saiki-gun, Hiroshima Prefecture

Claims (3)

[Claims] 1. A lower blade having an inclined lower blade having an upwardly-cutting rectangular blade and an upper blade having a downwardly-cutting rectangular blade that cuts a cast steel piece in cooperation with the lower blade. In the cutting device, one of the upper blade and the upper blade is supported by a fixed guide so as to be able to move up and down diagonally, and is attached to a holder that moves up and down by a hydraulic cylinder, and liners are attached to the sliding parts of the holder and the fixed guide, respectively. A cutting device for a cast steel piece, wherein one of the two liners slidingly contacting the holder and the fixed guide side is crimped to the other liner by an elastic means. 2. The holder has a recess into which the fixed guide is fitted, and the liner provided on the fixed guide and the holder on both sides of the fixed guide to be fitted into the recess is crimped by cutting resistance during cutting. 2. The cutting device according to claim 1, wherein one of the liner on the opposite side of the fixed guide and the liner on the other side of the fixed guide is biased by the resilient means so as to project toward the other liner. 3. The cutting device according to claim 2, wherein the elastic means is provided on the holder side.